Record-cylinder for graphophones



(No Model.)

W. KAISL-ING. RECORD CYLINDER PoR GRAPHOPRONRR, Rc.

-P'Rtentfed` May l1, 1897.

@j lv l I I l x UNITED. STATES` PATENT OFFICE.

l/VI'LLIAM KAISLING, 'UF CHICAGO, ILLINOIS.

RECORD-CYLINER FOVR GRAPHOPHONES, SLC. '4

SPECIFICATION forming part of Letters Patent No. 581,728, dated May 4, 1897.

Application filed February 15, 1897. Serial No. 623,526. (No model.)

` the following to be a full, clear, and exact descriptin of the invention, such as Will enable others skilled inthe art to which it appertains to vmake and use thesame, reference beingghad'to the accompanying drawings, and

-to tleletters of reference marked thereon,

which 'form a part of this specification. l

In the drawings, Figure l is-aside elevation of a complete cylinder. Fig. 2 is a central longitudinal section on the line 2 2 of Fig. 1. Fig. Bis a central longitudinal section showing modified ferm of construction, and Fig. 4 isa a transverse section on the .line/4. `4 of Fig. 2.

The impression or recordcylinder proper of fa graphophone or similardevice is'ordinarily made of a material which is quite brittie, and hence easily fractured It is cus ternary to make these cylinders tubular aud mount .them on a slightly-tapered mandrel,

` thebore of the cylinder having a correspondin changes of temperature.

ated. There is great danger also of fracturing taper, so that the parts'are held together by friction4 only. The mandrel is of a rigid material, usually Wood or metal, and is subJ ject to but slight variations in size as a result The material of which the record-cylinder is composed expands and contracts under the iniiuence of l changes of temperature to a much greater degree than that of the mandrel, aud hence it becomes necessary to exercise great care that the cylinder is removed from themandrel after using and before there has been any material variation in the temperature of the apartment in which the instrument is situingV the cylinder in adjusting it to theman- `drel, as the latter has been heretofore made, Iby applying more force than is necessary to bring the parts into proper relation, the taper being so slight tirata powerful wedge action results.

The object of this inyention is to provide a slightly yielding and compressible scat'for the record-cylinder, yet one-which will hold it rmly in place while in use; and to thisend the invention consists in constructing the mandrel jwith a slightly-conlpressible surface, as hereinafter described.

. ,5 In the drawings I` showfat A a conventional f shaft for carrying the complete cylinder, and

upon which themandrel B ismounted. In

one form 'of construction, as shown in Fig. 2, v

the mandrelB is provided at each end with 6o ananuular rib b and is inclosed Within a .sleeve D, preferably of` stiff paper. The internal diameters of the two ends of the sleeve correspond with the external diameter of the" tivo ribs bb, so .that the sleeve fits sn ugly vupon these ribs, to which it may be secured by the use of glue. The 'sleeve D is in 4this'form of construction of uniform taper, so that inter mediate of the ribs b b it is's paced apart from the body of the mandrel.

- The impression-.cylinder C is of ordinary construction, having the usual internal spiral rib c, and is of less length than the mandrel and when applied theretoiits upon the sleeve 'i D and is located intermediate of the ribs b b. 7 5.

In the construct-ion shown' in Fig. 8 the-mandrel B is of uniform taper throughoutits entire length, having -no ribs, and to it is applied a sleeve E, of greater diameter than the mandrel, but having its` ends contracted, as 8o shown atee,`so as to itsnuglyupon it to provide for the secure attachment of kthe two parts by the use of glue or other cement. The sleeve E, intermediate of. its contracted ends, is of uniform taper and receives the 8.5

mandrel-cylinderC in exactly the same man- 4 ner as does the'sleeve D. y 5

When the sleeve Dlor E is made of 'a stiff ber. paper and of a length exceeding but lit tle'the length of the impression-cylinder, it 9o forms a firm support for the latter and yet yields suicient-ly under thepressure dueto the contraction of, the latter to removeall danger of lits' fracture. In applying the cylinder to the mandrel it may be safely forced thereupon sufficientlyT to somewhatl contract the sleeve, and inthe event of its expansion by the warming of the apartment the sleeve will expand. to its normal size, and hence does not'lose its hold upon the cylinder.

IOC

15 with agid core,

It of course entirely immaterial whether the mandrel, intermediate of 'its ends, is of uniform taper or not, and if desired its body portion may be made inneh smaller in order -5 to lessen its weight.

I claim as my intention- V f 1. AThe combination of :trigid mandrel, with :t iicxible sleeve supenmposed upon the mandrel but in Contact there withat its ends only, :1nd an lnpression-cylimler. fitting upon the Sleeve vamd being located wholly between the*v lines of contact-of the sleeve with the mandrel;

2. In e mandrel for .recordeylinders' for graphopliones or the like`,"'tl1ecombination ot `inflexible sleeve superim posed upon the core and' in Contzwt there with 'et its ends only.' o

3; In e mandrel for reeord-cylimlers for gra-phophones, and the'like, the en mbinntiox with a. core vhaving and being mounted .upon its ribs-and vspaced apartfroxn its intermediateportions.

In `testimony whnfeof I affix myfsignatu-re in presence of two Witnesses.

WILLIAM' KAISMNG. "Vitnesses:

LOUIS K. GILLSON, IIESTER BAIRD...

ain annular rient eaeh 2c, end, of a exlble sleeve iulosing the core 

